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Sin2a cos2a. Cos2 (п/4 - a) если sin2a= -0,3. Cos2 a - sin2 a/ 4sin a cos a = CTG 2a/2. Cos4a sin 2 2a.
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Sin2a cos2a. Cos2 (п/4 - a) если sin2a= -0,3. Cos2 a - sin2 a/ 4sin a cos a = CTG 2a/2. Cos4a sin 2 2a. 